added warmup

.gitignore

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+node_modules/

nodejs/week3/app.js

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+import knex from 'knex';
+import express from 'express';
+
+const knexInstance = knex({
+  client: 'mysql2',
+  connection: {
+    host: process.env.DB_HOST || '127.0.0.1',
+    port: process.env.DB_PORT || 3306,
+    user: process.env.DB_USER || 'root',
+    password: process.env.DB_PASSWORD || '',
+    database: process.env.DB_NAME || 'hyf_node_week3_warmup',
+    multipleStatements: true,
+  },
+});
+
+const app = express();
+const port = process.env.PORT || 3000;
+
+app.use(express.json());
+
+const apiRouter = express.Router();
+app.use('/api', apiRouter);
+
+const contactsAPIRouter = express.Router();
+apiRouter.use('/contacts', contactsAPIRouter);
+
+contactsAPIRouter.get('/', async (req, res) => {
+  let query = knexInstance.select('*').from('contacts');
+
+  if ('sort' in req.query) {
+    const allowedColumns = [
+      'id',
+      'first_name',
+      'last_name',
+      'email',
+      'phone',
+      'created_at',
+    ]; 
+    const orderBy = req.query.sort.toString().split(',');
+
+    const sanitizedOrderBy = orderBy
+      .map(col => col.trim())
+      .filter(col => allowedColumns.includes(col));
+
+    if (sanitizedOrderBy.length > 0) {
+      query = query.orderBy(sanitizedOrderBy);
+    }
+  }
+
+  console.log('SQL', query.toSQL().sql); 
+
+  try {
+    const data = await query;
+    res.json({ data });
+  } catch (e) {
+    console.error(e);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
+app.listen(port, () => {
+  console.log(`Listening on port ${port}`);
+});

nodejs/week3/database.sql

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+CREATE DATABASE hyf_node_week3_warmup;
+
+CREATE TABLE `contacts` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `first_name` varchar(255) NOT NULL,
+  `last_name` varchar(255) NOT NULL,
+  `email` varchar(255) DEFAULT NULL,
+  `phone` varchar(255) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+insert into contacts (id, first_name, last_name, email, phone) values (1, 'Selig', 'Matussov', '[email protected]', '176-630-4577');
+insert into contacts (id, first_name, last_name, email, phone) values (2, 'Kenny', 'Yerrington', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (3, 'Emilie', 'Gaitskell', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (4, 'Jordon', 'Tokell', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (5, 'Sallyann', 'Persse', '[email protected]', '219-157-2368');
+insert into contacts (id, first_name, last_name, email, phone) values (6, 'Berri', 'Bulter', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (7, 'Lanni', 'Ivanilov', '[email protected]', null);
+insert into contacts (id, first_name, last_name, email, phone) values (8, 'Dagny', 'Milnthorpe', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (9, 'Annadiane', 'Bansal', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (10, 'Tawsha', 'Hackley', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (11, 'Rubetta', 'Ozelton', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (12, 'Charles', 'Boughey', '[email protected]', '605-358-5664');
+insert into contacts (id, first_name, last_name, email, phone) values (13, 'Shantee', 'Robbe', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (14, 'Gleda', 'Peat', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (15, 'Arlinda', 'Ethersey', '[email protected]', '916-139-1300');
+insert into contacts (id, first_name, last_name, email, phone) values (16, 'Armando', 'Meachem', '[email protected]', '631-442-5339');
+insert into contacts (id, first_name, last_name, email, phone) values (17, 'Codi', 'Redhouse', null, '401-953-6897');
+insert into contacts (id, first_name, last_name, email, phone) values (18, 'Ann', 'Buncombe', '[email protected]', '210-338-0748');
+insert into contacts (id, first_name, last_name, email, phone) values (19, 'Louis', 'Matzkaitis', '[email protected]', '583-996-6979');
+insert into contacts (id, first_name, last_name, email, phone) values (20, 'Jessey', 'Pala', null, null);
+insert into contacts (id, first_name, last_name, email, phone) values (21, 'Archy', 'Scipsey', '[email protected]', '420-983-2426');
+insert into contacts (id, first_name, last_name, email, phone) values (22, 'Benoit', 'Mould', '[email protected]', '271-217-9218');
+insert into contacts (id, first_name, last_name, email, phone) values (23, 'Sherm', 'Girardey', '[email protected]', '916-999-2957');
+insert into contacts (id, first_name, last_name, email, phone) values (24, 'Raquel', 'Mudge', '[email protected]', '789-830-7473');
+insert into contacts (id, first_name, last_name, email, phone) values (25, 'Tabor', 'Reavey', null, null);